Software Clock

Implementation of the clock module for the CC26xx and CC13xx. More...

Files
file	clock.c
	Software clock implementation for the TI CC13xx/CC26xx.

Functions
void	clock_init (void)
	Initialize the clock library. More...
CCIF clock_time_t	clock_time (void)
	Get the current clock time. More...
CCIF unsigned long	clock_seconds (void)
	Get the current value of the platform seconds. More...
void	clock_wait (clock_time_t i)
	Wait for a given number of ticks. More...
void	clock_delay_usec (uint16_t len)
	Delay a given number of microseconds. More...
void	clock_delay (unsigned int i)
	Obsolete delay function but we implement it here since some code still uses it.

Detailed Description

Implementation of the clock module for the CC26xx and CC13xx.

The software clock uses the facilities provided by the AON RTC driver

Function Documentation

void clock_delay_usec

(

uint16_t

dt

)

Delay a given number of microseconds.

Parameters

dt	How many microseconds to delay.

Note

Interrupts could increase the delay by a variable amount.

Definition at line 186 of file clock.c.

void clock_init

(

void

)

Initialize the clock library.

This function initializes the clock library and should be called from the main() function of the system.

Initialize the clock library.

Initialize the clock library.

We initialise the SysTick to fire 128 interrupts per second, giving us a value of 128 for CLOCK_SECOND

We also initialise GPT0:Timer A, which is used by clock_delay_usec(). We use 16-bit range (individual), count-down, one-shot, no interrupts. The prescaler is computed according to the system clock in order to get 1 tick per usec.

Definition at line 77 of file clock.c.

References count.

CCIF unsigned long clock_seconds

(

void

)

Get the current value of the platform seconds.

This could be the number of seconds since startup, or since a standard epoch.

Returns

The value.

Get the current value of the platform seconds.

The comparison avoids the need to disable clock interrupts for an atomic read of the four-byte variable.

Definition at line 159 of file clock.c.

CCIF clock_time_t clock_time

(

void

)

Get the current clock time.

This function returns the current system clock time.

Returns

The current clock time, measured in system ticks.

Get the current clock time.

When 16 bit it typically wraps every 10 minutes. The comparison avoids the need to disable clock interrupts for an atomic read of the multi-byte variable.

Definition at line 141 of file clock.c.

References count.

void clock_wait

(

clock_time_t

t

)

Wait for a given number of ticks.

Parameters

t	How many ticks.

Definition at line 177 of file clock.c.

References clock_time(), and start().